package com.hsmpay.utils;

//import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class ThreeDES {

private static final String Algorithm = "DESede"; //定义 加密算法,可用 DES,DESede,Blowfish
    
    //keybyte为加密密钥，长度为24字节
    //src为被加密的数据缓冲区（源）
    public static byte[] encryptMode(byte[] keybyte, byte[] src) {
       try {
            //生成密钥
            SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);

            //加密
            Cipher c1 = Cipher.getInstance(Algorithm);
            c1.init(Cipher.ENCRYPT_MODE, deskey);
            return c1.doFinal(src);
        } catch (java.security.NoSuchAlgorithmException e1) {
            e1.printStackTrace();
        } catch (javax.crypto.NoSuchPaddingException e2) {
            e2.printStackTrace();
        } catch (Exception e3) {
            e3.printStackTrace();
        }
        return null;
    }

    //keybyte为加密密钥，长度为24字节
    //src为加密后的缓冲区
    public static byte[] decryptMode(byte[] keybyte, byte[] src) {
    try {
            //生成密钥
            SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);

            //解密
            Cipher c1 = Cipher.getInstance(Algorithm);
            c1.init(Cipher.DECRYPT_MODE, deskey);
            return c1.doFinal(src);
        } catch (java.security.NoSuchAlgorithmException e1) {
            e1.printStackTrace();
        } catch (javax.crypto.NoSuchPaddingException e2) {
            e2.printStackTrace();
        } catch (Exception e3) {
            e3.printStackTrace();
        }
        return null;
    }

    //转换成十六进制字符串
    public static String byte2hex(byte[] b) {
        String hs="";
        String stmp="";

        for (int n=0;n<b.length;n++) {
            stmp=(Integer.toHexString(b[n] & 0XFF));
            if (stmp.length()==1) hs=hs+"0"+stmp;
            else hs=hs+stmp;
            if (n<b.length-1)  hs=hs+":";
        }
        return hs.toUpperCase();
    }
	public static byte[] hexStringToByte(String hex) {
		hex=hex.toUpperCase();
		int len = (hex.length() / 2);
		byte[] result = new byte[len];
		char[] achar = hex.toCharArray();
		for (int i = 0; i < len; i++) {
			int pos = i * 2;
			result[i] = (byte) (toByte(achar[pos]) << 4 | toByte(achar[pos + 1]));
		}
		return result;
	}
	private static byte toByte(char c) {
		byte b = (byte) "0123456789ABCDEF".indexOf(c);
		return b;
	}
	
	
//    public static void main(String[] args){
//        //添加新安全算法,如果用JCE就要把它添加进去
//        Security.addProvider(new com.sun.crypto.provider.SunJCE());
//
//        final byte[] keyBytes = {0x11, 0x22, 0x4F, 0x58, (byte)0x88, 0x10, 0x40, 0x38
//                               , 0x28, 0x25, 0x79, 0x51, (byte)0xCB, (byte)0xDD, 0x55, 0x66
//                               , 0x77, 0x29, 0x74, (byte)0x98, 0x30, 0x40, 0x36, (byte)0xE2};    //24字节的密钥
//        String szSrc = "This is a 3DES test. 测试";
//        
////        log.debug("加密前的字符串:" + szSrc);
//        
//        byte[] encoded = encryptMode(keyBytes, szSrc.getBytes());        
////        log.debug("加密后的字符串:" + new String(encoded));
//        
//        byte[] srcBytes = decryptMode(keyBytes, encoded);
////        log.debug("解密后的字符串:" + (new String(srcBytes)));
//    }

}